That’s weird. I found a few places on the net where that text is visible, someone using the peacemaker theme from refueled.net. I can’t find that text in the theme though or in the mistylook WordPress theme. Maybe the version you installed is different than the current one available for download.

I would grep through all the files in your web space and see if the work “Regisration” exists. If it does, then it’s coming from something installed on the server. If that word does not exist, then that’s coming from a plugin or something else installed on your server. Sometimes plugins are tied to certain domains, and having it on another domain will not work, and you might get a message like this.

Did you look through all your files for that word? If it’s not in the files, then it’s encoded in the files (some WordPress themes have that base 64 encoded crap in the theme) or it’s coming from somewhere else, right?

I would try to find out where it’s coming from so you can figure out how to remove it.

I see you’re running WordPress 2.6.1. What version bbPress did you install? I think I asked that before but I must have missed the answer. The alpha branch of bbPress is compatible with WordPress 2.6.* but the 0.9 branch is not.